CV 251 then AA 3634 at O'Hare
Anchorage → Chicago → La Crosse
Timetable, Chicago time
19:00CV 251 from Anchorage at the gate
10:30AA 3634 to La Crosse leaves the gate
15 h 30 apart on the timetable, overnight
AA 3634 leaves 15 h 30 after CV 251 arrives on the timetable: more than half a day, so not a connection we count.